id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
10869	Better handling of semicolon in values II: Warn about empty values	mdk	team	"When values are separated by a semicolon, each value must be valid. So empty values should not be allowed. But actually JOSM didn't complain about
* ref=;A1
* ref=A1;;A2
* ref=A1;

I think we could add a general warning if ""(!^;.*|.*;\s*;.*|.*;$)"" matches a value. Or is there any use case, where empty values are allowed in such a value list? In ""|"" delimited list they are."	enhancement	closed	normal	14.12	Core validator	latest	fixed	semicolon